Harmonics are periodic distortions of voltage, existing, or energy sine waves. Harmonics in ability distribution systems in many cases are a result of non-linear hundreds including switched mode dc electrical power supplies and adjustable pace motor drives.Gi?i m?i (bao g?m t?t c? gi?i nào có s? thay ??i, c?p nh?t m?i ho?c ?i?u ch?nh)Các ??a ph?